For aficionados of the two-wheel mode of transportation, we bring you a couple of ads from 1970, complete with a stiff jab against one competitor, at a time when most magazines sold page space to companies deeply rooted in four-wheeled motivation. And while Yamaha may have sprung for color, Kawasaki opted to the less-subtle approach in good old fashion black and white. If you were in the market for a motorcycle in 1970 and saw these two ads, which would you have sprung for?